<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"
                :closable="false"
                show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品的级联选择框 -->
                    <el-cascader
                   
                    :options="cateList"
                    :props="cateProps"
                    v-model="selectedCateKeys"
                    @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!-- tabs页签区 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) of scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                 <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled"  @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) of scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的会话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed"
        >
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的会话框 -->
        <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed"
        >
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            //商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger: 'hover'
            },
            // 级联选择框双向数据绑定到的数组
            selectedCateKeys:[],
            // 被激活的tab页签的名称
            activeName:'many',
            // 动态参数表格数据
            manyTableData:[],
            // 静态属性表格数据
            onlyTableData:[],
            // 控制添加对话框的显示和隐藏
            addDialogVisible:false,
            addForm:{},
            addFormRules:{
                attr_name:[
                   { required: true, message: '请输入内容', trigger: 'blur' },
                ]
            },
            // 控制修改参数的对话框的显示与隐藏
            editDialogVisible:false,
            editForm:{},
            editFormRules:{
                attr_name:[
                   { required: true, message: '请输入内容', trigger: 'blur' },
                ]
            },
           

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !==200)return this.$message.error('获取商品分类信息失败')
            this.cateList = res.data
            // console.log(this.cateList)
        },
        // 级联选择框选中项发生变换触发的函数
        handleChange(){
           this.getParamsData()
        },
        // 切换页签的函数
        handleTabClick(){
            this.getParamsData()
        },
        async getParamsData(){
            if(this.selectedCateKeys.length !==3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //  根据所选分类的id，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status !==200)return this.$message.error('获取参数列表失败')
             
            res.data.forEach(item=>{
                item.attr_vals = item.attr_vals? item.attr_vals.split(' '):[]
                // 每一行单独控制文本框的显示与隐藏
                item.inputVisible = false
                // 每一行单独的文本框输入的值
                item.inputValue = ''
            })
            console.log(res.data)
            if(this.activeName ==='many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听添加参数对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加对话框提交事件
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status !==201)return this.$message.error('添加失败')
                this.$message.success('添加成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 修改按钮对话框的显示
        async showEditDialog(attr_id){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status !==200)return this.$message.error('获取参数失败')
            this.editForm = res.data

            this.editDialogVisible = true
        },
        // 监听修改参数对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 修改参数提交事件
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                console.log(this.activeName)
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                console.log(res)
                if(res.meta.status !==200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id删除对应的属性
        async removeParams(attr_id){
            const confirmResult =await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err=>err)
            if(confirmResult !=='confirm')return this.$message.info('用户取消了删除')
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            // console.log(res)
            if(res.meta.status !==200)return this.$message.error('删除失败')
            this.$message.success('删除成功')
            this.getParamsData()

        },
        // 文本框失去焦点或者按下了enter键都会触发
        handleInputConfirm(row){
            if(row.inputValue.trim().length === 0 ){
                row.inputValue =''
                row.inputVisible = false
                return
            }
            // 前端显示
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 后台保存
            this.saveAttrVals(row)
        },
        // 
        async saveAttrVals(row){
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')})
            
            if(res.meta.status !==200)return this.$message.error('提交标签失败')
            this.$message.success('添加标签成功') 
        },
        // 点击按钮展示文本框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
             this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
        },
        // 删除
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        // 如果按钮需要被禁用则返回true，否则返回false
        isBtnDisabled(){
            if( this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        // 当前选中的分类id的值
        cateId(){
            if(this.selectedCateKeys.length ==3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName ==='many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-cascader{
    margin-left: 20px;
}
.el-tag{
    margin:5px
}
.input-new-tag{
    width: 120px;
}
</style>